Here is a fairly comprehensive calculator by World Wide Metric that converts length, weight, pressure, volume, and temperature. Living in South
Length: meter, kilometers, feet, yards, millimeters, centimeters, miles, and inches.
Weight: metric tons, kilograms, pounds, ounces, grams, and tons
Pressure: bar, kg/cm, and psi
Volume: milliliters, liters, fluid ounces, pints, cups, quarts, and gallons
Temperature: Celsius and Fahrenheit